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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S5 — Sep. 10, 2012
  • pp: A589–A596

Broadband absorption enhancement in a-Si:H thin-film solar cells sandwiched by pyramidal nanostructured arrays

Chuanhao Li, Liangping Xia, Hongtao Gao, Ruiying Shi, Chen Sun, Haofei Shi, and Chunlei Du  »View Author Affiliations


Optics Express, Vol. 20, Issue S5, pp. A589-A596 (2012)
http://dx.doi.org/10.1364/OE.20.00A589


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Abstract

A new thin-film solar cell structure with a broadband absorption enhancement is proposed. The active a-Si:H film is sandwiched by two periodic pyramidal structured layers. The upper dielectric pyramidal layer acts as matching impedance by gradual change of the effective refractive index to enhance the absorption of the active layer in the short wavelength range. The lower metallic pyramidal layer traps light by the excitation of Fabry–Perot (FP) resonance, waveguide (WG) resonance and surface plasmon (SP) mode to enhance the absorption in the long wavelength range. With the cooperation of the two functional layers, a broadband absorption enhancement is realized. The structure parameters are designed by the cavity resonance theory, which shows that the results are accordant with the finite-difference time-domain (FDTD) simulation. By optimizing, the absorption of the sandwich structure is enhanced up to 48% under AM1.5G illumination in the 350–900 nm wavelength range compared to that of bare thin-film solar cells.

© 2012 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(230.7370) Optical devices : Waveguides
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Photovoltaics

History
Original Manuscript: April 13, 2012
Revised Manuscript: May 31, 2012
Manuscript Accepted: June 12, 2012
Published: July 9, 2012

Citation
Chuanhao Li, Liangping Xia, Hongtao Gao, Ruiying Shi, Chen Sun, Haofei Shi, and Chunlei Du, "Broadband absorption enhancement in a-Si:H thin-film solar cells sandwiched by pyramidal nanostructured arrays," Opt. Express 20, A589-A596 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S5-A589


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